body {
    display: flex;
    overflow: hidden;
    width: 100%;
    height: 100vh;
    box-sizing: border-box;
    padding: 20px;
}

aside {
    margin-left: 10rem;
    width: 35%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: start;
}

aside .title {
    margin: 0;
    font-size: 5rem;
}

aside .content {
    font-size: 2rem;
}

.btnBox {
    margin: 30px;
}

aside .btnBox .login {
    width: 6rem;
    height: 3rem;
    border: 0;
    font-size: 1rem;
    background-color: #3366ff;
    color: #FFF;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

aside .btnBox .login:hover {
    background-color: #254eda;
    transform: translateY(-2px);
}

aside .btnBox .login:active {
    transform: translateY(0);
}

aside .btnBox .register {
    width: 6rem;
    height: 3rem;
    border: 2px solid black;
    font-size: 1rem;
    background-color: #ffffff;
    color: #000;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 1rem;
}

aside .btnBox .register:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
}

aside .btnBox .register:active {
    transform: translateY(0);
}

.img {
    flex: 1;
}

.img {
    margin-top: 120px;
    margin-left: 100px;
    display: flex;
    width: 900px;
    height: 800px;
    position: relative;
}

.img_1,
.img_2,
.img_3 {
    width: 270px;
    height: 800px;
    background: url(https://img.js.design/assets/img/64ec6053cc81290d1967a95d.png);
    background-size: 810px 800px;
    position: absolute;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.3);
}

.img_1 {
    background-position: 0 0;
    left: 0;
    top: 0;
}

.img_2 {
    background-position: -270px 0;
    left: 300px;
    top: 20px;
}

.img_3 {
    background-position: -540px 0;
    left: 600px;
    top: -20px;
}